Nelson Piquet and Kimi Raikkonen have yet to confirm if they will attend F1's 60th anniversary celebrations in Bahrain next weekend.
Organisers of the event announced plans to invite all 20 surviving F1 world champions to the F1 2010 season opener, which takes place on March 14, last month.
However while the likes of Mika Hakkinen, Damon Hill, Alain Prost, Nigel Mansell, Niki Lauda, Keke Rosberg, Alan Jones, Jody Scheckter, Mario Andretti, Emerson Fittipaldi, Jackie Stewart, Jack Brabham and John Surtees have all said they will attend, Piquet and Raikkonen have yet to make a decision.
"We expect the majority of the 20 plus cars to be displayed on track and, where possible, be driven by the original world champion," circuit advisor Martin Whitaker told the Gulf Daily News
Meanwhile Jacques Villeneuve hopes of actually racing in Bahrain and going up against fellow champions, Michael Schumacher, Fernando Alonso, Lewis Hamilton and Jenson Button have been dashed after Stefan GP was denied an entry slot [see separate story - click here
“Of course it's disappointing,” the 1997 F1 world champion told speedtv.com
. “The car and team looked very promising, but we always knew there was a risk without having the entry, and it was running late. So it's not a full surprise, but it's still disappointing.
“There was a lot of potential with the car. It was built and it was a full-blown project. It wasn't something started from scratch, and it was going to be competitive.
“It's a shame because it would have been a new team which could have run properly, but that's the way it is.”